| Podhaus Limited | Professional & scientific | 2006 |
| Poets Road Limited | Households | 1997 |
| Pouch Packaging Limited | Administrative & support | 2018 |
| PP08 Finance (Euro) Limited | Financial services | 2026 |
| PPD (Housing) Investments Limited | Real estate | 2022 |
| Premium Design Construction Ltd | Construction | 2013 |
| Prestova Limited | Wholesale & retail | 2026 |
| Prime Atelier Limited | Real estate | 2026 |
| Primexen Limited | Wholesale & retail | 2025 |
| Protopage Limited | Information & communication | 2005 |
| Psycap Ltd | Professional & scientific | 2021 |
| Pure Represents Limited | Arts & recreation | 2021 |
| Pure Vintage Wholesale Limited | Wholesale & retail | 2023 |
| Purple Mountain Brands Limited | Wholesale & retail | 2026 |
| Quench Solutions Ltd | Professional & scientific | 2022 |
| Rankvibe Ltd | Information & communication | 2025 |
| RAW Deli Ltd | Hospitality | 2020 |
| Raycore Secure Limited | Administrative & support | 2024 |
| RB Accountancy Services Limited | Professional & scientific | 2005 |
| Redwing Holdings 1 Limited | Financial services | 2026 |
| Relevate Ventures Ltd | Professional & scientific | 2022 |
| Remoteca Limited | Professional & scientific | 2022 |
| Remoteca Technologies Limited | Information & communication | 2023 |
| Rheaa Limited | Other services | 2026 |
| RHP Accountancy Limited | Professional & scientific | 2003 |
| Ringo Consulting London Limited | Professional & scientific | 2014 |
| RL Commercial Solutions Ltd | Wholesale & retail | 2024 |
| RN Clearpoint Learning Systems UK Limited | Education | 2017 |
| Rootfull Ltd | Professional & scientific | 2023 |
| Rosefield Associates Limited | Education | 2018 |
| Roseleigh Apartments Limited | Households | 2011 |
| Ruislip Consulting Limited | Information & communication | 2004 |
| Runware Ltd | Information & communication | 2023 |
| Rustix Ventures Ltd | Other services | 2004 |
| Ryan Real Estate Ltd | Real estate | 2024 |
| S J E Consultancy Services Ltd | Professional & scientific | 2023 |
| Sadie John Ltd | Extraterritorial | 2019 |
| SAFESPACE4YOUTHS Ltd | Health & social care | 2024 |
| SAI RAM Investments Limited | Administrative & support | 2004 |
| Saipriya Consultancy Ltd | Administrative & support | 2019 |
| Saltoun Road Management Limited | Households | 2002 |
| Samad 74 Ltd | Other services | 2019 |
| Samantha Goodhew Design Ltd | Professional & scientific | 2017 |
| Satllav Ltd | Health & social care | 2014 |
| Sazbay Ltd | Wholesale & retail | 2026 |
| Sean Doyle Painting Contractors Limited | Construction | 2013 |
| Second Chance Financial Ltd | Administrative & support | 2025 |
| Security Operations Solutions Limited | Information & communication | 2021 |
| Send Architecture Ltd | Wholesale & retail | 2025 |
| Serviceware Ltd | Information & communication | 2010 |
| Seventy Summers Ltd | Professional & scientific | 2023 |
| Shah Hussain Property Investment Ltd | Real estate | 2025 |
| Shooter's Hill Lawn Tennis Club Limited | Arts & recreation | 2006 |
| Shshahzaib Ltd | Wholesale & retail | 2026 |
| Shuriken Productions Ltd | Information & communication | 2024 |
| Simgur Property LLP | | 2023 |
| Simply 2 Kwik Limited | Transport & logistics | 2025 |
| Skehard Locum Ltd | Professional & scientific | 2023 |
| Sky Blue Media Ltd | Information & communication | 2020 |
| Sky Housing Solutions Limited | Real estate | 2023 |
| Small Restorations Limited | Construction | 2013 |
| Smart Choice Cart Ltd | Wholesale & retail | 2026 |
| Smart Financial Systems Ltd | Information & communication | 2019 |
| SNS Design & Developers Ltd | Construction | 2020 |
| Snuggswear Ltd | Manufacturing | 2023 |
| Softjump Ltd | Information & communication | 2021 |
| SOH Holdings LLP | | 2025 |
| Sooner Safer Happier Ltd | Information & communication | 2020 |
| Sophy Cave Design Limited | Professional & scientific | 2022 |
| Soulspring Ltd | Health & social care | 2024 |
| Specialty Commodities Supply Chains UK Ltd | Mining & quarrying | 2024 |
| Sports Intelligence UK Ltd | Education | 2014 |
| Spozywczak Limited | Wholesale & retail | 2025 |
| SRE Holding (UK) Company Limited | Financial services | 2021 |
| SRE Korea Holding (UK) Company Limited | Financial services | 2024 |
| SRE Oceanview UK Holdings Company Limited | Financial services | 2024 |
| Srii Kumaran Silk Limited | Wholesale & retail | 2006 |
| Staal Properties Limited | Real estate | 2020 |
| Starsound Capital Ltd | Hospitality | 2023 |
| Stefanlstefanov Ltd | Professional & scientific | 2026 |
| Stem Checker Ltd | Information & communication | 2026 |
| Sterling Gate Limited | Wholesale & retail | 2025 |
| Stevefudge.Co.Uk Limited | Arts & recreation | 2017 |
| STF Professional Services Ltd | Professional & scientific | 2021 |
| Stocksite Limited | Construction | 2003 |
| Stonepeak Formosa 4-2 Holdings Company Limited | Financial services | 2020 |
| Stonepeak Formosa 4-3 Holdings Company Limited | Financial services | 2020 |
| Store-It (Stamford) Limited | Administrative & support | 2006 |
| Storm International Holdings Ltd | Information & communication | 2021 |
| Strategic Giant Limited | Real estate | 2020 |
| Subsea Infrastructure Limited | Water & waste | 2004 |
| Suburban Basements Limited | Construction | 2006 |
| Sudan Feeds London Ltd | Health & social care | 2025 |
| Suedo Enterprises Ltd | Professional & scientific | 2015 |
| Supporting Motherhood Ltd | Health & social care | 2025 |
| Surmountor Lighting Co Limited | Wholesale & retail | 2025 |
| Syntonica Limited | Professional & scientific | 2006 |
| Syntric Midco Limited | Financial services | 2026 |
| T Star UK Ltd | Wholesale & retail | 2019 |
| T1K Energy Limited | Professional & scientific | 2013 |